Trillian

If you are looking for a free-to-download chat client that’s full of features and skinnable, then Trillian shapes up as a prime candidate. It’s a stand-alone client and it offers supports for chat via Facebook, Windows Live, MySpace, Yahoo, Email, AIM, Skype, Google Talk, Jabber, ICQ, Bonjour, and IRC. Trillian can also assist in the management of users’ various social media accounts like Twitter and Facebook.

Furthermore, Trillian offers functionality not present in most of the clients supplied by the supported services, but at the same time it lacks none of those services’ standard features. That means things like video and audio chat, file transfer, group chat, buzz, tabbed chat, drawing via tablet, plug-ins, message history, user avatars, multiple connections, notifications, support for proxies, plus encrypted messages are all implemented.